I am trying to create flanges on both the top and bottom of this sheet metal part. I need the flanges to be on the top and bottom edges. The part is tapered so its having trouble.

The regular edge flange tool overlaps/interferes the flanges at the bends so this will not work. And I could not get the Miter flange tool to work any better. It would not propagate to create multiple flanges.

Is there a way to make flanges on this part without having to cut away and work around the edge flange problems?

I attached the SW File as well as a general picture of what it will become as an assembly for reference.